But it could be overwhelming if you start to get alerts from each and every app in your iPhone. 

You can make use of notifications more effectively by managing to receive only from the Apps that are important to you. 

Go to Settings -> Notifications and tap the app from the list to turn the Notification on/off specifically for that App.  To certain extend, turning off the unnecessary notifications will help to keep the battery longer. 

You can determine which notifications you want to receive and how do you want to receive. Go to settings -> Notification. You can turn on/off various settings like sounds, show on lock screen, badge app icon, banner, preview, etc., for the notification by app basis.  To manage these settings for a specific app, tap the app and go to details screen.

Go to Settings -> Notifications and scroll down to manage Government (Amber and Emergency) alerts.

You can delete all the notifications received for a particular day by tapping ‘X’ next to the day.

If want to respond to a notification or see more information swipe left over the notification and tap ‘View or press deeply on the notification. You also have a choice to 'Clear' that particular notification.

To clear all notifications, press any 'X' deeply and select 'Clear All Notifications'

To open the app that sent the notification just swipe right over the notification and tab 'Open'. If it’s a notification for a missed call, you can call back by swiping right and tab ‘Open’.  

In iOS 11, you can access many features when your iPhone screen is locked. Usually you can go to notification center by swiping down from top after unlocking your phone. Now you can bring up all the notifications, by swiping up from the middle of the lock screen. All the notifications will be listed by day and you can scroll down to see the older notifications. 

From the lock screen, you can open the camera by swiping to the left. Today's view of Widgets will appear if swipe to the right of lock screen. Touch the 3 dots below 'Press home to open' and swipe up to open the ‘Control Center’.

You can access Apple Pay stored cards by double-clicking the Home button, if 'Double-Click Home Button' is enabled in Settings -> Wallet & Apple Pay.

You can activate Siri to search from lock screen. If enabled, you can return missed calls and also reply to messages from lock screen.

To manage the widgets, scroll to the bottom and tap Edit. You may have to use Touch ID or provide Passcode to go to the 'Add Widgets' screen. 'Add Widgets' screen will display already added widgets and the available apps to add as widget. To remove an existing widget, tab the red '-' at the left and tab the 'Remove' button at right. To add a widget, scroll down to the list of 'More Widgets' and select '+' at the left of the app to add as widget.

Same options are available when you take a screenshot. You can add Markup or text before saving the screenshot.

In iOS 11 with the introduction of File App, you can share any document in your Google Drive easily as you share a photo in iPhone. 

To share a file from Google Drive using Files App, open the Files App and go to 'Browse' section. Navigate to the file that you want to share in Google Drive. Touch and hold the file name to open contextual menu. Use the right scroll arrow to go and pick 'Share' option. Now you can see all the available options to share the file.

Open the Files App and go to 'Browse' section and select the drive in which you stored the folder. Navigate to the specific folder and touch and hold the folder to open the contextual menu. Select 'Tags' that will open the Tags screen with the list of already created tags. You can add the folder to one of the available Tags, or create a new tag using 'Add a New Tag' option at the top. 

Repeat these steps to add multiple folders to a tag. Once all the folders are added to a tag, they will be available for quick access under the particular tag in 'Browse' section. 

Currently this feature is not supported for OneDrive, but still you can browse OneDrive content using Files App. 

To add a folder to the Favorites, open the File App and use 'Browse' option to go a folder at a particular storage. Hold the folder to bring the contextual menu. Once you add the folder in the ‘Favorites list', it will be available in the 'Browse' section of the Files app under favorites. This will save you few navigation steps and time if you access a folder frequently by going to the location of the folder in cloud storage. 

To remove a folder from Favorites, go to ‘Browse’ option of Files App and Tap 'Edit' on the top right corner. Touch the ‘-‘at the left of a folder and tab the ‘Remove’ button at the right. 

To change the name of the existing tags, go to ‘Browse’ option of Files App and Tap 'Edit' on the top right corner. Now you can touch the name of a tag and edit the name. 

To delete, touch the ‘-‘at the left of the tag and tab the ‘delete’ button at the right. 

To rearrange a tag, touch and hold handle at the end of the label name and drag and drop to a place that you want. 

Create Tag option is available only when a file is tagged. 

Go to any file and touch and hold a file to bring the contextual menu. Go to the right of menu bar and select ‘Tags’. Now you'll see an option 'Add New Tag' at the top of the Tags list to create a new Tag. In the Add New Tag screen you can give a name and color to create a new Tag. 

You can assign files to the available default tags, or create your own tag with a label and color. To add a tag to a file, browse to a particular file location and hold on the file.  Contextual menu will open up from which you can select a tag to assign to the file. In the same screen you'll see an option to create a new tag as well. 

After adding a file to a tag it'll be available at the browse section under that tag for quicker access later. You can tag a single file to multiple tags. 

When you want to take regular single shot Photos most of the time, it's better to turn off Live Photos. To turn off the Live Photos, touch the yellow (when it's turned on) circle at the top of the Camera. Once turned off, yellow circle will turn it to white. This method of manually disabling Live Photos will last only for that particular camera session. If you close the camera and open again, Live Photos would have been turned on again. 

If you have to make the preference of Live Photos stay permanently then go to Settings -> Camera -> Preserve Settings and enable Live Photo. This'll preserve your Live Photos preference. 

It's fun to experiment with these modes and get enjoyable experience with your photos. With vivid mode, color and saturation can be increased and make the colors stronger. Dramatic and monochrome variations allow controlling the light and adding professional touch to the pcitures. 

By turning on the Camera Mode, now you can preserve the last shot mode in the camera. Go to Settings → Camera → Preserve Settings to turn on the Camera Mode.